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Note 3 - Investment Securities Available-for-Sale (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Note 3 - Investment Securities Available-for-Sale (Details) [Line Items]
Debt Securities, Weighted Average Duration	3 years 292 days
Federal Home Loan Bank Stock and Federal Reserve Bank Stock	$ 16,793,000us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock	$ 22,560,000us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock	$ 10,599,000us-gaap_FederalHomeLoanBankStockAndFederalReserveBankStock
Available-for-sale Securities Pledged as Collateral	256,600,000us-gaap_AvailableForSaleSecuritiesPledgedAsCollateral
Securities Holdings of any One Issuer Exceeding 10% of Shareholders' Equity	$ 0egbn_SecuritiesHoldingsOfAnyOneIssuerExceedingTenPercentOfShareholdersEquity	$ 0egbn_SecuritiesHoldingsOfAnyOneIssuerExceedingTenPercentOfShareholdersEquity
Debt Securities [Member] | Total Investment Securities [Member] | Investment Securities Concentration Risk [Member]
Note 3 - Investment Securities Available-for-Sale (Details) [Line Items]
Concentration Risk, Percentage	99.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = egbn_TotalInvestmentSecuritiesMember / us-gaap_ConcentrationRiskByTypeAxis = egbn_InvestmentSecuritiesConcentrationRiskMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_DebtSecuritiesMember

X

- Definition

Period of time between issuance and maturity of debt securities, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	egbn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

Securities held by any one issuer exceeding 10% of shareholders' equity.

+ References

No definition available.

+ Details

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Namespace Prefix:	egbn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The fair value of available-for-sale securities that serve as collateral for borrowings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5086-111524

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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X

- Definition

Amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

+ References

No definition available.

+ Details

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- Details

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